Multiple tool holder



March 21, 1944- P. A. GUENTHER '1122344509 MULTIPLE 'TOOL HOLDER Filed Dec. l5, 1941 2 Sheets-Sheet l gn/UWM Paul fuenher March 21, 1944- P. A. GUENTHER MULTIPLE TOOL HOLDER Filed Dec. y15, 1941 2 sheets-sheet 2 Patented Mar.Y 21, 1944 UNITED `'STATES PATENT OFFICE 2,344,509 g MULTIPLE TOOL HGLDER Paul A. Guenther, Houston, Tex.

Application December 15, 1941, Serial No. 423,093

4 Claims.

My invention relates to certain new and useful improvements in devices for holding a plurality of tools on the slide of a lathe, and it particularly has for an object to provide a tool holder. constructed in such manner that a -high degree of accuracy in the work being done `on the lathe may be maintained and yet a quick and accurate adjustment of the tool-head about its` axis may be made when it is desired to change from one tool to another. y ,K i

More particularly the invention relates to that type of tool holders exempliiied by the patents to H. Newmann, No. 1,031,956, of July 9, 1912, and No. 1,195,390, of August 22, 1916,

Other objects of my invention are; to so imp vent accurate work according to present-day` standards of accuracy; to provide a'means by which the tool-head may be accurately held for use on lathes having diierent swings and rigidly secured to the lathe slide so as to remain fixed against accidental displacement; to improve the tool-head in such manner that a more proper relief angle of the cutting tool relative to the work can be maintained; and, in general, to so simplify and improve previously known multiple tool holders of the type stated that the holder may be employed satisfactorily on work requiring the extreme degrees of accuracy demanded by modern machine-stop practice.

Other objects will in part be obvious and in part will be pointed out hereinafter.`

To the attainment of the aforesaid objects and ends the invention still further-resides in the novel details of construction, combination and arrangement of parts, all of which will be first fully described in the following detailed description, and then be particularly pointed out in the appended claims, reference being had to the accompanying drawings, in which- Fig. 1 is a side elevation of my tool holder.

Fig. 2 is a top plan view of the same.

Fig. 3 is a rear elevation of the same.

Fig. 4 is a horizontalsection on the line .4-4 of Fig. 1.

Fig, 5 is a cross section 0n the line 5-5 of Fig. 4.

Fig. Fig. 4.

Fig. per se.

Fig. 8 is a detail section on the line 8 8 of Fig. 1, but drawn to the scale of Fig. 7.

Fig. 9 is a detail section on the line 9-9 of Fig. 2, but drawn to the scale of Fig, 7.

6 is a cross section on the line 6 6 of '7 is an enlarged face view of the tool-head Fig. 10 is an elevation of one of the arcuateV blocks used in the tool-head.

Fig. 11 is an end view of the block shown in Fig. 10.

Fig. 12 is a plan view of the same.

In the accompanying drawings, in which like numerals and letters of reference indicate like parts in all the figures, l represents the new and improved tool-head which has a spindle 2 mounted in a bore 8 of a block 1. The spindle! has an annular groove 3, preferably of shallow depth, and an annular series of four ratchetrecesses il. The end of the spindle is threaded as at 5 to receive the adjusting nut l0 and jamb nut l! which are located in the counter-bore or chamber 9 of the block 1 and have kerfs l2 to receive a Spanner wrench. The block l has a neck 38, the end of which ts into a circular recess 6 in the tool-head l (see Fig. 4).

A cover plate I3 is held over the entrance to chamber 9 by screws I4,

The block 1 has a vertical bolt hole l5 to receive the bolt l5 whose head l1 has a cup-washer I8 fitted into the slot I9 of the slide rest 20 of a lathe (not shown). When the device is used with a 9" swing lathe the block 1 is directly secured to the slide rest 20, but when it is being used on an 11l swing lathe a spacer block 2| of the required thickness is interposed (see Fig. 3) between the block l and the rest 20. A washer 22ab and nut 22 serve, with the bolt i6, to secure the block (and the spacer when used) rigidly and securely in place on the slide rest 20.

The ."block 1 has a horizontal bore 23 located with its axis in a horizontal plane above that containing the axis of the spindle 2, by virtue of which the bore 23 will line up with the ratchetrecesses 4 (see Fig. 6). In the bore`23 is located a reciprocatable pawl 25 and a spring 21. The pawl 25 has a spindle engaging projection or end 26 to t the ratchet-recesses 4. A screw plug 28 having a kerf 3l is threaded at 24 into the bore 23 to tension the spring 2l, as well as to retain the pawl 25 and the spring 2T in the bore 23 closed off from debris (shavings, chips, dirt, etc).

The block 'l also has a second Ibore 36 whose axis lies in a plane containing the axis of the spindle 2, i. e., extends radially of the spindle. The bore 36 lines up with the annular groove 3 of the spindle and contains a friction-lock shoe 29 having a spindle contacting face 30 to conform to the curvature of the spindle at the groove 3. There is also provided a-threaded counterbore 35 to receive the clamp screw 32. 'The screw 32 has a reduced non-threaded end 3| 'to enter the bore 36 and enga-ge the shoe 29, and a knurled head 33, the latter being, preferably, provided with radial tapped recesses 34 to receive a turning rod or keyB (see Fig. 5)

The tool-head l is in the nature of a disc and is divided into four operative parts set apart. These parts are composed of tool receiving recesses 39 disposed four in a vertical plane and four in transverse directions (see Figs. 4 and 7).

Each recess 39 has a base wall 4I) and a radial wall 4I (Figs. 9, 4 and 1) composed of plane surfaces. Each vertical recess 39 also has an arcuate wall 42, while each transverse recess 39 has an arcuate wall 43. The walls 42 and 43 cooperate with arcuate segment blocks 44, each having a curved face 44a to t the curvature of the walls 42 and 43 and a flat face 44D (Figs. 2 `and 8 to 12, inclusive) The tool-head I also has a set of recesses 45 to receive the short set screws 48 anda set of recesses 46 to receive the long set screws 43. The screws 48 and 49 have squared sockets 4'I to receive'a wrench by which the screws may be tightened or loosened as desired.

The tools T are located between the blocks 44 `and are clamped tightly in'place Vby the pairs of 'screws vlIl--48 or 49-49, asthe case may be. By

loosening up one of the pair of screws and tightening the other the tool may be adjusted to the proper height or held at different angles, as occasion may require, whereby fine adjustment of therelief angle may be had.

When in use, spindle 2 is so positioned that pawl projection 2S lies squarely in a recess V4 of the spindle and screw 32 is tightened up so as to lforce shoe 29 into tight engagement with the ispindle and with sufcient pressure to prevent the accidental turning of the spindle from its initial position of adjustment.

When another tool is to be brought into pcsition for use, screw 32 is loosened and tool-head I is turned by hand, by quarter turnsuntil the tool desired is in position for use, whereupon =screw 32 is again tightened to hold the spindle '2, and consequently head I, from turning.

From the foregoing description, taken in connection with the accompanying drawings, it will be observed that all moving parts of the tool, such as the head I against block I, `spindle 2, pawl 25-26, and shoe 29, are entirely enclosed and no chips, shavings, grit or dirt can get into the same to interfere with the accurate working of vthe a vertical plane and project into therecess (see Fig. 8).

In Figs. 1 and 3 of the drawings a indicates the top of a 9" swing lathe slide rest, while bindicates the top-of a 11l swing lathe slide rest.

From the foregoing description, taken inconnection with the accompanying drawings, it is thought that the construction, operation and advantages of my invention will .be clear to -those skilled in the art.

What I claim is:

1. In a multiple tool holder, a block, .means to secure the block tothe slide vrest of a lathe, said block having a neck and a spindle receiving bore passing through the neck,-a tool-headhaving a spindle located in said bore and havingan annular recess to fit over theend of -saidneck, said spindle having an annular locking groove wholly enclosed in said block and having an annular series of ratchet-recesses wholly enclosed in said'block, means enclosed within a chamber in said block for holding said spindle against movement along its axis while leaving the spindle free to be turned, a longitudinally movable spring-pressed pawl carried by and wholly enclosed in said block to engage in said ratchetrecesses, a clamp shoe mounted in and enclosed by said block to engage said annular locking groove, and a screw plunger carried by the block to engage said clamp shoe to force it into hold- 'ing engagement with the spindle.

2. -In a multiple tool holder, a tool-head comprising a body having a spindle, a block in which 4said spindle `is mounted for .rotary adjustment,

.said :body having at least .one'set of connected grooves, one groove 'of the set .being located -ln the periphery of thelbody and the other grooveof the set being located at right angles tothe first groove and in the face ofthe body, each of said grooves being defined by a flat base wall and a at back wall normal to the base wall and an arcuate wall opposite the back wall, block segments to fit each of said grooves and each-having an arcuate face to fit said arcuate walls and a flat face to-oppose said at back walls, and clamp screws carriedby 'said body toY project through said iiat back walls and engagea tool placed in said `grooves against said block segments and adjustably secure the same `in'place.

3. In la multiple tool holder, a tool-head comprising a bodyrotatablefor adjustment about its axis, said body having a 'set of grooves in 'its rfront face and a set oftransverse grooves in 'its periphery, 'the grooves of a set .being spaced an equal number .of degrees apart, each groove be- 'ing dened by aat'base wall, a lat back wall normal to the base wall and an arcuate wall opposite the back wall, said body having clamp screw recesses and bores, .the .latter opening through said back wall, set screws in said bores, and an arcuate `segment block having an arcuate wall to register with said arcuate wall of the Vbody Aand a flat wallopposite lsaid back wall, by-virtueof allof which a. tool may be ladjustably clamped in the body `vgrooves between the Aset screws and the .arcuatesegment .block for purposes described.

4. In .a multiple tool holder wherein is provided a tool head comprising a body rotatable for adjustment about-its axis; the improvement which comprises the provisionof a set of trans- Y verse toolzreceiving grooves in the peripherynof the body and a ,set of jgenerally radially Adisposed tool receiving grooves :in the frontace .ofthe body, the peripheral grooves :intersecting the front grooves, eachgroove ybeing defined by av .blocks being `cur-ved son 'radii :corresponding to the longitudinal and transverse curvatures oisaid .arcuate .walls ofsaid grooves, Vand 'clamp screws carried by said body to cooperate with saidblocks `for .purposes described.

-fPAUL viA. GUENTHER. 

